97 lines
2.2 KiB
C++
97 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsAutoPtr.h"
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#include "nsCOMPtr.h"
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#include "nsCycleCollectionParticipant.h"
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#include "nsISupportsUtils.h"
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#include "nsTransactionItem.h"
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#include "nsTransactionStack.h"
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#include "nscore.h"
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nsTransactionStack::nsTransactionStack(nsTransactionStack::Type aType)
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: mType(aType)
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{
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}
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nsTransactionStack::~nsTransactionStack()
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{
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Clear();
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}
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void
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nsTransactionStack::Push(nsTransactionItem *aTransaction)
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{
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if (!aTransaction) {
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return;
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}
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// The stack's bottom is the front of the deque, and the top is the back.
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mDeque.push_back(aTransaction);
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}
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already_AddRefed<nsTransactionItem>
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nsTransactionStack::Pop()
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{
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if (mDeque.empty()) {
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return nullptr;
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}
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RefPtr<nsTransactionItem> ret = mDeque.back().forget();
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mDeque.pop_back();
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return ret.forget();
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}
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already_AddRefed<nsTransactionItem>
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nsTransactionStack::PopBottom()
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{
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if (mDeque.empty()) {
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return nullptr;
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}
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RefPtr<nsTransactionItem> ret = mDeque.front().forget();
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mDeque.pop_front();
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return ret.forget();
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}
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already_AddRefed<nsTransactionItem>
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nsTransactionStack::Peek()
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{
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if (mDeque.empty()) {
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return nullptr;
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}
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RefPtr<nsTransactionItem> ret = mDeque.back();
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return ret.forget();
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}
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already_AddRefed<nsTransactionItem>
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nsTransactionStack::GetItem(int32_t aIndex)
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{
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if (aIndex < 0 || aIndex >= static_cast<int32_t>(mDeque.size())) {
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return nullptr;
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}
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RefPtr<nsTransactionItem> ret = mDeque[aIndex];
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return ret.forget();
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}
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void
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nsTransactionStack::Clear()
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{
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while (!mDeque.empty()) {
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RefPtr<nsTransactionItem> tx = mType == FOR_UNDO ? Pop() : PopBottom();
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};
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}
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void
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nsTransactionStack::DoTraverse(nsCycleCollectionTraversalCallback &cb)
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{
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int32_t size = mDeque.size();
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for (int32_t i = 0; i < size; ++i) {
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nsTransactionItem* item = mDeque[i];
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if (item) {
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NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "transaction stack mDeque[i]");
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cb.NoteNativeChild(item, NS_CYCLE_COLLECTION_PARTICIPANT(nsTransactionItem));
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}
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}
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}
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